Why do people like modern warfare 2?

you see thats the problem with all online shooters, they are good at first because the true fans buy them, but after word spreads of how good the game is N00bs start to buy the game and take over, just look at Halo 3, that game is crawling with n00bs, and even though they normally move on to new games, with the case of Modern Warfare 2 they havnt because all of the newer Call Of Duties are way harder than MW2 so it seems like MW2 is gonna be n00b central for a long time, and by the way have you tried firing the Desert Eagle on that game? ridiculous recoil...